A369003 Numbers k for which k' / gcd(k,k') is odd, where k' stands for the arithmetic derivative of k, A003415.

2, 3, 4, 5, 6, 7, 8, 10, 11, 13, 14, 17, 18, 19, 22, 23, 24, 26, 27, 29, 30, 31, 32, 34, 36, 37, 38, 40, 41, 42, 43, 45, 46, 47, 48, 50, 53, 54, 56, 58, 59, 60, 61, 62, 63, 64, 66, 67, 70, 71, 72, 73, 74, 75, 78, 79, 80, 82, 83, 84, 86, 88, 89, 90, 94, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 109

Offset

1,1

Comments

Numbers k such that A276085(k) is not a multiple of four. - Antti Karttunen, Nov 11 2024

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(PARI) isA369003(n) = !A369001(n); \\ See the code in A369001.

Crossrefs

Positions of odd terms in A083345, A373377 and in A373485. Positions of 0's in A369001.

Cf. A003415, A276085, A369002 (complement), A377874 (characteristic function).

Subsequences: A369007, (A377869 U A377875).

Cf. also A368999.

Sequence in context: A058363 A049810 A132018 * A377869 A334142 A044919

Adjacent sequences: A369000 A369001 A369002 * A369004 A369005 A369006

Keyword

nonn

Author

Antti Karttunen, Jan 14 2024

Status

approved